expose extras from gltf nodes (#2154)

fixes #2153 

expose the `extras` field value as a string

crates/bevy_gltf/Cargo.toml

@@ -29,6 +29,7 @@ bevy_utils = { path = "../bevy_utils", version = "0.7.0-dev" }
 gltf = { version = "1.0.0", default-features = false, features = [
     "KHR_lights_punctual",
     "KHR_materials_unlit",
+    "extras",
     "names",
     "utils",
 ] }

crates/bevy_gltf/src/lib.rs

@@ -7,8 +7,9 @@ pub use loader::*;
 
 use bevy_app::prelude::*;
 use bevy_asset::{AddAsset, Handle};
+use bevy_ecs::{prelude::Component, reflect::ReflectComponent};
 use bevy_pbr::StandardMaterial;
-use bevy_reflect::TypeUuid;
+use bevy_reflect::{Reflect, TypeUuid};
 use bevy_render::mesh::Mesh;
 use bevy_scene::Scene;
 
@@ -19,6 +20,7 @@ pub struct GltfPlugin;
 impl Plugin for GltfPlugin {
     fn build(&self, app: &mut App) {
         app.init_asset_loader::<GltfLoader>()
+            .register_type::<GltfExtras>()
             .add_asset::<Gltf>()
             .add_asset::<GltfNode>()
             .add_asset::<GltfPrimitive>()
@@ -69,3 +71,9 @@ pub struct GltfPrimitive {
     pub mesh: Handle<Mesh>,
     pub material: Option<Handle<StandardMaterial>>,
 }
+
+#[derive(Clone, Debug, Reflect, Default, Component)]
+#[reflect(Component)]
+pub struct GltfExtras {
+    pub value: String,
+}

crates/bevy_gltf/src/loader.rs

@@ -703,6 +703,12 @@ fn load_node(
 
     node.insert(node_name(gltf_node));
 
+    if let Some(extras) = gltf_node.extras() {
+        node.insert(super::GltfExtras {
+            value: extras.get().to_string(),
+        });
+    }
+
     // create camera node
     if let Some(camera) = gltf_node.camera() {
         node.insert_bundle((
@@ -780,21 +786,24 @@ fn load_node(
                 let material_asset_path =
                     AssetPath::new_ref(load_context.path(), Some(&material_label));
 
-                let node = parent
+                let mut mesh_entity = parent.spawn_bundle(PbrBundle {
-                    .spawn_bundle(PbrBundle {
                     mesh: load_context.get_handle(mesh_asset_path),
                     material: load_context.get_handle(material_asset_path),
                     ..Default::default()
-                    })
+                });
-                    .insert(Aabb::from_min_max(
+                mesh_entity.insert(Aabb::from_min_max(
                     Vec3::from_slice(&bounds.min),
                     Vec3::from_slice(&bounds.max),
-                    ))
+                ));
-                    .id();
 
+                if let Some(extras) = primitive.extras() {
+                    mesh_entity.insert(super::GltfExtras {
+                        value: extras.get().to_string(),
+                    });
+                }
                 // Mark for adding skinned mesh
                 if let Some(skin) = gltf_node.skin() {
-                    entity_to_skin_index_map.insert(node, skin.index());
+                    entity_to_skin_index_map.insert(mesh_entity.id(), skin.index());
                 }
             }
         }
@@ -815,6 +824,11 @@ fn load_node(
                     if let Some(name) = light.name() {
                         entity.insert(Name::new(name.to_string()));
                     }
+                    if let Some(extras) = light.extras() {
+                        entity.insert(super::GltfExtras {
+                            value: extras.get().to_string(),
+                        });
+                    }
                 }
                 gltf::khr_lights_punctual::Kind::Point => {
                     let mut entity = parent.spawn_bundle(PointLightBundle {
@@ -833,6 +847,11 @@ fn load_node(
                     if let Some(name) = light.name() {
                         entity.insert(Name::new(name.to_string()));
                     }
+                    if let Some(extras) = light.extras() {
+                        entity.insert(super::GltfExtras {
+                            value: extras.get().to_string(),
+                        });
+                    }
                 }
                 gltf::khr_lights_punctual::Kind::Spot {
                     inner_cone_angle: _inner_cone_angle,